Drive-pulley release



O. T. SODERGREN DRIVE PULLEY RELEASE March 17, 1925. I 1,529,751

Filed 'Ang- 4, 1924 Patented Mar. 17, 1925.

OTTO T. SODERGREN, 0F ROCKFORD, ILLINOIS.

DRIVE-PULLEY RELEASE.

Application filed August 4, 1924. Serial No. 729,943.

To aZZ whom it may concern:

Be it known that I, O'rro T. SODERGREN, a citizen of the United States, residing at Rockford, in the county of WVinnebago and State of Illinois, have invented certain new and useful Improvements in Drive-Pulley Releases, of which the following is a specification.

This invention relates in general to machine elements-and has more particular reference to a drive pulley release, that is, a drive pulley or the equivalent which will automatically release from the driven member whenthe resistance becomes excessive or exceeds a predetermined pressure. A device of this kind might be termed a selfacting stop clutch and is especially adapted for use in the transmission of power toma chines where it is desired to disconnect the driving and driven parts immediately upon the resistance exceeding a predetermined pressure as, for example, when for any reason the machine does not function properly and sets up an excessive resistance.

The primary purpose of my invention is to provide an improved 'drive pulley release or device of the character described which may be applied to any machine or in any driving train for automatically disconnecting the driving and driven parts when the resistance reaches an excessive or danger point. The principle and mode of operation of my improvements will be apparent from the following description when considered in connection with the accompanying drawing, in which Figure 1, is an end view of a device of the character described embodying my invention;

Fig. 2, is a section taken substantially on the line 2-2 of Fig. 1;

Fig. 3, is a fragmentary section taken on the line 33 of Fig. 1; and

Fig. 1, is a face view of one of the dogengaging recesses in the driving pulley.

In the present embodiment of my invention the driving member is in the form of a pulley designated generally by 5 and the driven member a shaft 6. The pulley is loosely journaled upon a sleeve 7 keyed or otherwise suitably secured to the shaft 6. Except as influenced by the action of the driving dog and compression spring as will be presently described the pulley is free to revolve and slide lengthwise upon the sleeve 7. The sleeve has formed integrally there- PATENT OFFICE.

with at one end a head 8- havi-ng a shoulder 9 against which the pulley is normally urged thereon for varying the pressure of the.

spring.

One or more drive-transmitting and releasing dogs 13 act between the pulley 5 and collar 8 for establishing driving connection there-between and for automatically releasing the pulley from the head and consequent y the. driven shaft when the resist ance of the latter becomes excessive. In the present instance two dogs are employed, each being pivotally attached tothe head 8 on diametrically opposite sides thereof by a machine screw 1 1. -These screws are coaxially disposed and each is radial with respect to the shaft 6. Each dog is preferably formed of flat material and has a laterally offset driving nose 15 which is in a plane circumferentially spaced from its pivot axis as viewedfrom Fig. 1 and offset laterally therefrom, that is, lengthwise of the driven shaft as'shown in Fig. 2. The nose 15 of each dog has a thrust face 16 parallel with the axis of the shaft 6 and a face 17 at right angles thereto. The face 16 connects to the body proper of the dog by an arcuate face 18 which merges into one of the parallel sides 19 of the dog body. The dogs are arranged as shown in Fig. 1 so that their driving noses are disposed on opposite sides of the diametrical plane in which the pivot bolts aredisposed so that the dogs will drive in a common direction.

The driving pulley has formed in its face contiguous to the shoulder 9 on the dog-carrying head 8, recesses 21. complemental to and shaped to receive the offset driving ends of the dog. A hardened steel plug 22 is inserted in the pulley adjacent to each recess 21 and cut away in conformance with the shape thereof so as to provide hardened surfaces against which the faces 16 and 17 of the respective dog engages, as

shown plainly in Fig. 3.

lVith the foregoing organization of parts it will be manifest that when the drive pulley is revolved in a clockwise direction viewing. Fig. 1 it will transmit rotary. motion to the shaft 6 through the intermediary of the dogs 13 and the sleeve 7, it being manifest that the compression spring 11 yieldingly holds the pulley engaged with the dogs. In view of theofiset relation of the drivg. acese f theadqgs there i avcomponent of pressure tendirigto turn the idQgS on their respective p-ivot bolts and force the pulley lengthwise, against the pressure of the spring 11. Thespringhowever is of suflicient pressure to overcon'leflthisicomponent and hold the pulley in driving connection with the dogs. lh hen howeventhe resistance of the shaft 6 overcomes the pressure .of q the spring. the dog w l the t nned; on their; pivot bolts by -the;,greater dr vi ggpressu Of i l'l'e pulley nd the let-- -1 yield lengthwise against the pressur .Q said sp ng: to :Memnmod t said movement of the dogs, until the offset end of each (dog is t-entirelyremoved from its complem nt-a1 reees fi aas shown-in dot e ines Fig, 3, z thereby d sconne ng the pulleyaand{shaft T s parts remain connected until manually replaced in their onetative-drivmgrrela ioa It-ifs believed thatthe foregoing conveys a cl ar understanding of theobjects prefiaeed above "and While I have illustrated but single working embodiment it should be understond that changes might be i made in details 1 of construction Without depart ing froim thezspirit and scope of the invention' as expressed :in the appended claims, in which? ltlaim: i

1. In ;cornbinatiom: a driving and a drivenmemha in coaxial-,relation a; drive tnansm-itting deg pivotally1 mounted onv the driven memberfo lianiaxis radial with respect thereto, arneoess, inthe .drivingimemberli-n Whichthe edogeisaadaptecl toengage inidrivetransmitting contact, 121 ispifing yildingly urging the driving member axially of the driven member for maintaining said drive- "transmitting contact, the driving end of .the-dQg-heing spaced from its pivot axis.

circumferentially and lengthwise of the axis-of said members, whereby a component In combination, a shaft, a sleeve keyed th reon and having: a headattone end, a pulley yjournaled ao-n the sleeve, a spring urgingith-e pulley against said head, a dog pi-votallly nlommted'on the heathen an-iaxis radially disposed with respect to the shaft, and-a recess in-thepulley adjacentto the headiin which recess the dog is. adapted to normally tengage for establishing driving connection in -,one direction between the pulley and shaft, the end of the-dog engaged i-n-cthe pulleyi recess being offset a from the pivot axis of the-.dQg-both circumferentially and longitudinally of the pulley axis, -.vvhereby .to provide a release t connectioni between a the 3 pulleyfiandi shaft in which the pulley will i be axially displaced vagainst said spring pressure tilting of the *dog under 1 the influence of. excessive resistance.

aOIiTQ SODERGREN. 

